A thin bar magnet of length 2 ℓ and breadth 2 b pole strength m and magnetic moment M is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is

Question

A thin bar magnet of length 2 ℓ and breadth 2 b pole strength m and magnetic moment M is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is (A) m (B) m / 2 (C) 2 m (D) m / 4

Tardigrade Admin · Accepted Answer

As breadth of each part is half the original breadth, therefore, pole strength becomes half (i.e. m/2).

Q. A thin bar magnet of length $2 ℓ$ and breadth $2 b$ pole strength $m$ and magnetic moment $M$ is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is

m

$m /2$

$2 m$

$m /4$

As breadth of each part is half the original breadth, therefore, pole strength becomes half (i.e. $m /2$ ).

Q. A thin bar magnet of length 2ℓ and breadth 2b pole strength m and magnetic moment M is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is

m

m/2

2m